"The need to represent" seems to be operative, here, so  I looked up the term "represent" at Urban Dictionary dot COM and found several definitions, including:

3.) "To annoy others with your presence. An activity often carried out by 'playaz'" ['players', for you white folk, meaning : A male who is skilled at manipulating ("playing") others...A certain class of low-rent, slack-jawed f#ckups has decided that backstabbing and misogyny are totally radical... (also Urban Dictionary)]..

6.) A phrase showing acknowledgement to one's background, home, social group, or original place of residence. Also similar to giving a Shout Out to one's homeboys. [sic]

So, I'm guessing the the "phrase"  Harley-Davidson is you your way of shouting out to your homies, those others who have set themselves apart from the general motorcycling  community through conspicuous consumption of high-end boutique goods.
I'm just a pretend psychiatrist, not a sociologist, so I could be wrong.
 
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